Is Your Clutch Mech Affecting Your Suspension?

You know that little switch on your clutch mech? That magic little mute button? Well does that clutch affect your suspension?

I had a hunch that the clutch on my mech was inhibiting the initial movement of my rear suspension. We already know that anti-squat (pedalling) and anti-rise (braking) affect the suspension ability to do its job properly. So it is only a small leap of logic to assume that the clutch inhibiting your mechs movement, (thus affecting chain growth) is adding to that mix.

I’d proposed this question a few times and was always met with two responses;

“Yeah probably.”

and

“There are bigger influencing forces, like rocks on the trail! The clutch exerts such a small amount of force that it makes no difference!”

So with no way to prove or disprove my hypothesis the debate always ended there, that is until I had an extended loan of a Shock Wiz. The Shock Wiz is a suspension setup aid, it plumbs into the air valve of air forks and shocks, monitors them on the trail and offers setup advice and feedback. With the latest update to the app, this little unit now offers a far more nuanced tool for suspension tuning. It also offered the opportunity to experiment and get some data to further my curiosity on the subject.

Time for the science bit.

The experiment was simple, I had gotten my Shock Wiz score to 88% and I was feeling pretty happy with how it was all feeling. I would do a control run of a fairly typical piece of natural Scottish single track, then again with the clutch switched off. This direct comparison would show if the Shock Wiz detected a difference in the shocks behaviour.

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The test track was a lovely little ribbon of prime condition singletrack on the southern edge of Aberfeldy. Comprising of fast and pedally sprint sections, drops and root matrices, so providing a good variety of trail conditions to test on.  After a few runs it was time to consult the app and see if the Wiz had noticed a difference.

My prediction was that the Shock Wiz score would decrease and the low speed compression would need increased by a few clicks and maybe a few more PSI in the air spring. My thinking being that the clutch would inhibit rider induced movement and would be more active to small bump input.

 

So in short, yes the derailleur clutch does impact the suspension,

Whilst the suggestion after the first run was that with the easier breakaway more air pressure was required, however after successive runs it settled back to the green. So, my prediction was partially right, the compression was affected, but it was in the high-speed over my predicted low. So in short, yes the derailleur clutch does impact the suspension, now the question was, how much of an impact does it actually make?

Well the initial suggestion, with the mech activated was that the high-speed was far too firm, listed fully in the red. So by the apps measure, it needed adjusted by three or more clicks softer. Now the Cane Creek Inline, has an adjustment range of four full turns on HSC. So if we take one half turn to equate to one click of adjustment, three or more clicks is a significant tweak that the app is looking to make.

However with the clutch turned off the app was only looking to make an adjustment of one to two clicks, so maybe a single half turn. That is more or less in the right ball park in my view.

Something that I did find interesting, is the lack of a braking shudder feedback that I experienced with the clutch turn off. With the clutch on, when I was at full chatt through a rock garden I had significant shudder from my rear brake. My reckoning was that this was my shock and clutch fighting it out due to brake jack. With the clutch no longer fighting the HSC the shudder didn’t occur. Shock was able to do its job and the bike just monster trucked along.

Conclussion:

Did it make a difference to what I experienced as a rider? In some circumstances.

Was the bike louder? Well, yes.

Did I drop a chain? No, I have a chain guide and narrow wide front chain ring for that.

Did the the app measure an improvement with it turned off? Yes, the tuning score improved by 5%.

Will I run the mech with it switched off form now on? In some circumstances, yes I will.

Will this be a definitive answer to this question on STW? HAHAHAHAHAHAAHAAA, sorry was that a serious question?

Standard Rant

New standards, everybody loves them, wait no the other one, nobody loves them. Pink bike keyboard warriors love them, nothing gets them going like a new axle width. What do I think, well, I don’t care and neither should you.

This little shed based rant/vlog I cover the ground I previously wrote about in this post.

 

Why I Don’t Trust CO2

Co2 cartridges, small, light and fast. Its like they come from the future. But I’m increasingly not a fan. Here is why I don’t trust Co2 carts as far as I can throw them, and I have a terrible throwing arm.

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CO2 Inflator

Moray Monster Trails

Nestled far enough of the normal drag Moray Monster trails doesn’t get the rep it deserves.

Outside Fochabers and set over two hills with a road running between them, the trails are a superb mix of flowing jump and berm filled blue, red and technical blacks. Whilst having a tight natural character, the loops themselves aren’t too long. So a few laps of the red or a mix of all three trails is perfectly achievable in a few hours riding.

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The trails are in a really good state of repair, probably partially to do with the lack of traffic compared to other remote centres like Wolftraxs.

The Lord of the Rings themed red has a few big features like some drops and beefy sized kickers, but they are so well made and with clear landings that they are very easy to send. Alongside the red is a sadly short, steep, northshore infested orange “freeride” trail. The flipside is that the short nature of the trail means pushing back up is pleasingly quick.

The other hill has a a blue figure of eight loop and the infamous Gully Monster trail. The Gully Monster is a very different beastie to the other trails on offer and I cant really think of any other trail like it. Whilst being a fairly fast and undulating red, the thing that sets this trail apart is its exposure.

Tightly hugging the side a decidedly steep gully, the trail is flanked by thick ferns and blae berries hiding both the precipitous drop and the trail ahead. The trail may be mostly flowing narrow singletrack, but there are a few steep chutes and rooty sections with little room for error which keeps you on your toes.

So in short, its a rad little trail centre. It has a very distinct flavour and is well worth the trip over other bigger names if your looking for something a little bit different from your trail centre this winter.

Banshee Spitfire 200 Mile Review

200+ Miles in and the Spitfire has lived up to the promises made by modern geometry.

Thought I would share my thoughts on this bike and have a wee bike check of the build and how its holding up. To summerise, the frame is amazing and well balanced now the fork is behaving. Starting to build pace and confidence, but its still a newish bike to me and I don’t put in as many miles as I did when I got its predecessor.

That said I rarely get less than a top 3 time on any given trail I ride on it, not half bad.

 

Blog Awards Public Vote

Stravaiging is through to the public vote stage of the UKBlog awards 2017

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The awards which are in their third year the awards celebrate companies and individuals who use a blog and web content to spread their message and to share thoughts and opinions. The awards recognise and celebrate those who generate engaging content and who share best practice, with 16 award categories the UKBlog awards represent the full spectrum of blogging being produced today.
 
The long list is then opened up to a public vote with the finalists being judged by a panel of industry experts.
The public vote is now open so please vote here.
The vote will close on Monday 19th December at 10.00am

I work really hard to make the site what it is and a vote is a deeply appreciated way to help support both the site and my blogging, which will help me to promote and share my bike based adventures.


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